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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac203923a6e2893b339f102488c1b0e6bd9986fae9938150b31747c7455d59a' 
  AND token = '361rfP2NV+d0sZiM7MnmHUZsIw+WqC58R2odLsakxxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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