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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea689aaeeffafaac2961b9faed56e19bbbc4717d8936d173a39760fcf9acbbc' 
  AND token = 'SbSu6NiDxu5mFdkX7pZTojl1iPQycWo83NggvwKin2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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