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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e907e7ad46dce4638adaa9a99844440a1ac3b1c0584477b79dabaded3c6d2b6' 
  AND token = '8uR5bTqYRs3ebo2EydthqxAz8P0e2u5KDEq+I6REg4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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