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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ecb5b56bfed76d05c13b17526ddad554823f0958207a0390d8e2b30065d3ca' 
  AND token = 'Ps08Yn/IOEXhnz3NG/eRhb+Tev6I93Z+reT2yFKy4Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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