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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eab7dff8a28db4ac2e14a65ad48f7b2941d5bb1e9179a6c4b95621c0f99b919' 
  AND token = 'SH/V2caxL7JNS75u+RuFKzZzFQISikMjZz/++as1gIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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