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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856dd9c1baa2917e878b19783b77b94ab9060e25e6f7e96910e9817592787dc3' 
  AND token = 'Ow7REVSW+EX1wNHG88Bqg6yFnLlgXwMNxcvB+q6E/X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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