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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b29eb70d45032097df296738c97f11b295c7d4bf3c853940a4d23f99cbfd5bf' 
  AND token = 'nTrkOBDpnNZFmiZpqEMp9rxxKkyQ50x2Z/J7ds6TuPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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