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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4d178b4242e4e96ab7151f53acbf88c423a5302d24fbd2ac4cb29c0220bb5a' 
  AND token = 'Amo2KNJOW3uET1a/KFjGlvzE4KO32P4MJuk9UcI+gmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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