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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9158db1c2444e528ccc93d266599f20ac2680238e09992db350a7ac6dd95c194' 
  AND token = 'Eh7VbRvRWIvUyL5dmJ+ZlVaaW+LvjWN3M7wz2e0ovQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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