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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ad0ec221df2c7d0a1a50b357b5543756bf6081641ca9aeab499174258094e' 
  AND token = 'JhzH7p3rUGniRybWQmm7OgxO22Kteq4EC0baqNf9vXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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