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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fc9a68d4df40ad2b04cd418f3e89fbf0ac816743256a13cc8c4ad0cf5f2b4e' 
  AND token = '45vsk/UkPWf6PidJh2ry6KHSPriFq+LozoZ2npJDSBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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