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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956846a1e9baa02416a123ec3e5732972d243c8cfe8a500e63f040d84161fd48' 
  AND token = 'qcYX9S46e979AxnltY58lagFkJ49KzsP2VFa4+QWb8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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