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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd8ed6fce914c1b6744f7c0f21638af53d99b706a76177f2d86386c32a94eb2' 
  AND token = 'nnmDd51+lXh6niuFJOWdtta/lSbdQMy7qg3hvRIbNHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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