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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3fc1dadec8f8aed3ea996da1805ee5ec642e3be67f51b57db6eb3952aba132' 
  AND token = 'YYTXgjAeLb8ySs3JEM1GZjAZpVYosWfpkZpd4D8zus0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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