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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9ef935e534815631b045288b479a18d79b796009f9ab96dd45e450b5073259' 
  AND token = 'shv0Z1T2kzoU91Z+J2FNfspr537QIFL7rhT6ZY02rzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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