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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfc5e14e50cd45fe9820e2c960360444a7aa90f77591d2c50c47fe9d5aff132' 
  AND token = 'Qq7zBlFS/aJZkHP4Y6wxG5BQaqCLVmV9W03OK7KM5oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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