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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b038d51766fafe930497c607c1135472a53a6baf9af9684e8318ba524e58b8' 
  AND token = 'LX5YiV7hHMJgcw+SGyA1iSs3v5rTw3ksp0xGrb2E4F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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