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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd5d42510081e1881d021ce06abb5a3e37be517e2349fbc6f622582d9e8129b' 
  AND token = 'gJp9DXmWfnfkuRpr0BQTWvGhXkPl2bSbqwrt5aoEJqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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