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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15744db33c8ad4894f9f14023c41f2a0b8b63d21858d94b191be842ca5484f5e' 
  AND token = 'BisjWhKaovUQzhpr/2Tq25QVidCslWEDr6Ld9hf0XxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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