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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c30320d722c8343d9d25d7ffd669f928b6149cc682e41f26a78e412f0abaf48' 
  AND token = 'urjymcDX73wk9d7teHSkaEO4lJD6amt58LKrT733OaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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