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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a02b706503bb81c9a435c2bcd4f3fc15f0444087c1001ea31ddbf205b06d4d' 
  AND token = 'XWBZS20D0J2lcxcNlluSO0cSAeUeZ236DDa5xWSfFQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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