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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebb0c9b795ecc6d0db2b71b3692a02e9094d08c13f76253706a35f5ef7f1fcc' 
  AND token = 'ebHK0Lx/nxW11KzSMXVtHO6oeq7YNpY3vENn4gCgJcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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