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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ef2e50e1eab65eb118d2d12439ce7c7f55cf59508664f86c37d10426337f49' 
  AND token = 'LMHcFwutuiX8M9Q/cmTleHr/yw4DRYoz5RH77ffXokg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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