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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7514ba09bfb413e7ca3f5ceaa7069810d273b7794347df8fcec03c3e93a002b' 
  AND token = 'zdXaWKk2kOk6uRcutp1GhmEVKmoWb4c+bf+zLvLz9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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