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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cee7428ae086694da5165104638055e4579c07786ab9072c75a5a5e150b560' 
  AND token = 'ef3kZlmxEORqXaLmG102TkgpdLfZ6sKJBvYSm1QKjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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