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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede1ebafd5ca7bcef9f95306fcfed597e5b898610d7307c1406e958fec51068e' 
  AND token = 'MmSYfwC38w38A0tCc1k16Aek39pFRXV/8FTCRY7lq84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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