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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a7291ec3a1a9f5381ff8027779d0ec2c15ffc4fdb3e3a99e86db0ade1c4f08' 
  AND token = 'awKrtHb464Kwk3yp4DViPwpL9fHxwnuSOfoZZrrRCGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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