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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c488bf1b0b1762290604e952d930a5a72ed7e1430120763844217fcac12e0f3d' 
  AND token = 'kxlczETcHfwvn/uoEMqnpA3LYNG1aSvncwZeDXQHOAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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