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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cda359342a8f91d4c44c5b0f17701804da46648708b5cdb5ab3152d63ad877c' 
  AND token = 'IzTUYghmY9dJWdArim6lq4ryAWSLis0YDl9RZvUK2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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