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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca7809f50c2df2eb210df7fa9f7ecfe05c9213753f4b2594ed7b004a18e94ed' 
  AND token = 're8sQ32OLQE/ov1rWUal6URN43SDfzzQt08duvTLa6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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