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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711aba17e01c94c75166b76f75ab318c3c4ad105650847a38b7752ccc7548317' 
  AND token = 'YGhuTGcB9kR5lcGooxjYMTsuiJXBOHOPE53UZpB0lbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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