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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48abb6057464ec6fa5bcb9b3bb15c8ea436717560b1cdfd541a9aa576e17ca6' 
  AND token = '+jk8cQM66RgOggk9EAfxaAD7jAAr4k4S4ztC4e0FNCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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