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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f36b24d4a7141ac922b22abd832b6a793666472dbed73a53a6edb04983ff8ed' 
  AND token = 'xE0T05iJiMWz5CWS853L8usvpGh8frOcqMaSmf/bEFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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