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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f1a8f4fbcfbc1bf088470d1d7f88c6e42b40b05661bf350ec0a1f32859dcaf' 
  AND token = 'NgsLJcVn20rCdF3Xl4qeu933v3jFxn7E+VEufDzG//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}