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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b6227f283659c56dba7c382ff80be607d9592649c0d06d8369ee0fcdd6a32e' 
  AND token = '3ZDDgTfjA2ldD6aHknYtfwyaxtfN5oW333X7rKNtE8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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