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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4614a13f8e6fe1e64f5699af5cf4e0e5a33ba4f2959dff946125f7b9e5984b' 
  AND token = 'JApo5G7vrZqxmtuNDecqzhqNgK+uN71aTgBapZ3MUQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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