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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7203779b04ed49956291cabec2ad2fa5b56906ead4780a1b372ffc8b754517' 
  AND token = 'W2PaOhkL/5XOGE8lYdTsYKYcVtenfApSHbSQPuJWfnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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