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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2610a293a35de714f37e3d618cc84e1e6210e7c357d926d6eabfddcdf54b0b0' 
  AND token = 'gO8QBXT3LC0LKCNc0wtw/6rLPsel4QMRppeL6vKYmYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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