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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94640482f1c0aa9b1b40a7c22dce3738bfeff3f27d601477e54e1f32a2f5951' 
  AND token = '6tErg964j+c7CyUzq9e6l6xEIZ1u0M0u1i9GNZEnhUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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