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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69dca80dbf94996d0eae197bcbbc755a1731443b3e9cb7538e4a013b22f6529c' 
  AND token = 'VjL1Kd85tzQn8eNOtbh9XHmlVUVEf41bHUZtqj41KYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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