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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab665d49de3e0ced956fedf3224f2f918f57966d7153eaf154a52360f94c83ac' 
  AND token = 'DXlY/7R4d0DDeog10AAxmmag8Pi6sdRbRpPCewbZpKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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