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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d398a97b49dacf2905ac4ccdbd65161b19a8d1776efa667ca9a8bbd92db451' 
  AND token = 'JLJu94GGo8pwUSuEWeFWG8UAFpCJuFe/53fVJzK3fnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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