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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb8d3ead92a002eb306d2d28aea6a3da9534f29c08b1c4314e2c25dc4382127' 
  AND token = 'Ih851o1OqXE1udSmaSiWexahCUURdWeQ2uaz0hdU1XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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