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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce1b33e4041542666cc9c83f215e01dfa21e247fa4e86bb656978b98d9950b9' 
  AND token = '/rFhkQFn1fWPh1oXtTE/+FoyEffEAaoMlPsuw2lPV7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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