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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebce996def937ad164bcd3fb2168a5740f2bd171e6e253a9f6b0fca81579e72c' 
  AND token = 'PLAaEI+93ye1QPEO5jrqr7D9XMUxxOyAJw1Sg8YpkY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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