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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74108cc250764c3d50557d592200daf0fe70555d4af389dee1e2d451b4795e49' 
  AND token = 'sSIZVsyn+FzHZEynIb7adb5geDIcVd72CS/2RuWMZvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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