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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32520f8ecfbb20f95758019d2e4c594109f574f773e10a5784dd500556dbe2a6' 
  AND token = 'Z8NrKjKr1RHyRGa4/KUJd+A6Ru6SOpB3MsGb4B88E8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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