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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae99075a07e8532d7380882bf126d6e7fe6f807408174710101c955248f0d0ed' 
  AND token = 'ZdRXcXq+LVObsHjJHCRoWECXaC9eDdf9TPx3LJI9ndY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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