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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8cce7349ac3cab1410711a5b2e94c4d0ee3aba7fd023b3758aa233bbf1cd70' 
  AND token = 'vezkgJ/U95a5sujgOh4fO0BBd5e02pUsDJJjB04+kK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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