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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1123f8d3bb358929b980d707a4aba96a4b1de7f0c52777777efc5c629e6dad9a' 
  AND token = 'f67FowfECkbfV0cJMqi8vkXMSO7r4rmINi2w2qApnxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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