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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec67ea4d599aaae9b9dbd076ad503c709052ba8d242f81879e23e6fcd4ee87d' 
  AND token = 'VLqfDLXS8OxPE3Bxrl5V1bVBmS9N/ZhAAG3/CDJPhRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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