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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5ce2f6b8f64db11943033c386a50cc666eeddb8ba9ffaba8618dacae3472dd' 
  AND token = 'vIQ39Xn3pn3qPm0jly54o9VI6clo/f+kGATyCKGSEas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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