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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f95784b0a91fa4ce7c364f38a1ef106466070ed721170fd23c8635726d20514' 
  AND token = 'y9ChvPUGDWys0+8SA/U5lrmsh2GCIJ9f0Kmj8RfTGNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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