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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfe69a24cf50d0210eeedaf1d4220335655857e77b1dfb0699aa1f7612ab49a' 
  AND token = '5+gBDaDA7JErOZuvtXeX1e+Et2+QsxlZMkv+b/LWYE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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